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It is often convenient to associate ports with strings.
Thus, the procedure open-input-string associates a port
with a given string. Reader procedures on this port will
read off the string:
(define i (open-input-string "hello world"))
(read-char i)
=> #\h
(read i)
=> ello
(read i)
=> world
The procedure open-output-string creates an
output port that will eventually be used to create a string:
(define o (open-output-string))
(write 'hello o)
(write-char #\, o)
(display " " o)
(display "world" o)
You can now use the procedure get-output-string to get
the accumulated string in the string port o:
(get-output-string o)
=> "hello, world"
String ports need not be explicitly closed.
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